Find the sum of the first ten terms of the sequence -4, 1, 6, ........41 in the tenth term. The answer is 185. I need help finding the rate, and the set up of the equation, I can't seem to figure it out.

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This is an Arithmatic progression where each term is 5 more than the previous term

so putting in the values u get
\[s _{10} = 10/2 (-4 + 41) = 5 x 37 = 185\]

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